Rack/component fans?

Think cabinet, not rack. Best that you isolate the components from the acoustic energy in the room, racks do not do that. I've tried racks, many different kinds but found the cabinet works best, and yes, proper ventilation is a must. The latter is not hard given the low cost of laptop coolers on the market.

Buconero117,
I don't think you answered his question. Anyway how can a laptop cooler be used, as they are usb powered. (Lastly, is usb 12 volt, and if so can you cut off the end and attach a 12v wallwart plug?)

I'm likewise looking for a super quiet fan to cool my tube poweramp.

You could try coolerguys.com. I asked them a question a couple of weeks ago and they never answered but maybe you will have better luck.

Mark